Jumper for interconnecting spaced electric terminals



Dec. 20, 1955 J. M. DE MONTMOLLIN 2,728,056

G SPACED ELECTRIC TERMINALS JUMPER FOR INTERCONNECTIN Filed Feb. 24, 1953 INVENTOR JAMES Mdeh/DNTMOLLIN I"! 74% 51 Y B ATTO NEY James :1. De lt/lontmollin, 'Griifin, -'Ga.,

United States Patent 25728 056 JUNIPER FOR lNTERCONNECTING-SPACED ELECTRIC TERMINALS assignor -to :SouthenrStates Equipment Corporation, .a corporation 1 of Georgia Application February 24, 1953, Serial No. 338,385 1' Claim. ((1339-19) This invention relates toelectric jumpers and more particularly to jumpers adaptable for use in conjunction with a wide range of circuit voltages.

Power fuses and cutouts tion under all service conditions. Suchmaintenance procedures ordinarily must be conducted without interrupting the flow of load current. In ,order to maintain an adequate contact pressure therebetween thereby to establish a path of high electrical conductivity between the of the jumper shown in Figs. 1 and 2 viewed from the direction in which Fig. 1 is viewed.

With reference to Fig. 1 a pair of insulators 1 and 2 respectively support terminal assemblies 3 and 4. Terminal assembly 3 is electrically slot 118and. lateral 2,728,05l Patented Dec. 20,

doctor 5 and is provided with a hooked terminal elemen 6. Similarly terminal-assembly 4 is electrically intercon with apparatus.

As canbest be seen from Fig. 2 the jumper comprises a pairof telescopically related contacts 11 and 12. Aflixed to the upper end of contact 11 is a ring element-13 which is secured to contact 11 by screws 14.

The contact 12, as is best shown in Figs. 1 and 2, is provided with a plurality of laterally extending hooked contact projections 15. The lower extremity of the contact 12 is constructed with a hollow portion 16 provided disjointable connection ating rod.

As can best be seen from Fig. 3 the contact 11 is biased axially relative to the contact between the jumper and the opering formed within a projecting tab 20 formed integrally with the ring element 13. The lower end of the spring 19 is connected 21 secured within the contact As is shown in Fig. 3 the lower end of the contact 1 is in engagement with the pin 21 which acts as a In order to facilitate the establishment of a good electn'cal connection between contacts 11 and 12 and to increase the current-carrying capacity of the contacts, the

by screws 25 to the contact element 12.

24 extend through the associated slots 23 the contact 11 in a slideable relationship. In order to mount the jumper in its Contact fingers so as to engage understood that jumpers constructed according-to this invention are applicable to a wide range'of space and voltage conditions. I

It will also be understood that the contacting portion 26 of each of the contact projections 15 is spaced from the axis of the contacts 11 and 12 so that when the jumper is inits-service position the action of the biasing spring -19 tends to impart a bending moment to the jumper assembly as a whole which tends to cause the outer surface of contact 11 to engage the inner surface of contact 12 by a pressure engagement thereby to aid in reducing 7 the electrical resistance therebetween.

- It will also be understood that the stop 21 limits relative movement of the contacts in both directions by respec tively engaging the lower end of contact 11 and the stop 22.

In view of the above description it will be understood that by the invention 1 have provided an improved jumper which is readily adaptable to a wide range of voltage and space conditions, which affords good electrical conductivity between the terminals to bebridged by the jumper and which is relatively simple in construction and therei fore reliable in application to a wide range of conditions.

While I have shown and described a particular embodiment of the invention 1 do not wish to be limited thereto and intend in the appended claim to cover all such changes and modifications as fall within the true spirit and scope of the invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

A jumper for interconnecting a pair of spaced electric terminals said jumper comprising a first contact engageable with one of said terminals, a second contact telescopically related with said first contact and having a plurality of laterally extending contact projections of conducting material spaced therealong for selectively engaging the other of said terminals, biasing means tending to impart relative axial movement to said contacts, the contacting portion of each of said contact pro ections being spaced from the axis of said contacts so as to cause a bending moment to be applied to said contacts thereby to maintain contact pressure therebetween, first stop means affixed to one of said contacts and engageable with the other of said contacts to determine the limit of relative movement of said contacts in one direction, and second stop means affixed to the other of said contacts and engageable with said first stop means to determine the limit of relative movement of said contacts in the other direction, one of said contacts having at least one slot therein in the telescoping part thereof, and a contact finger afiixed to said one contact and extending through said slot slideably to engage the other of said contacts.

References Cited in the file of this patent UNITED STATES PATENTS 

